The construction of the graphs formed by eight-circuit and its secants is obtained.
本文给出了测地图包含八圈时，八圈和它上的割线构成图的结构形式。
Our algorithm employs the Divide and Conquer strategy, bisection and secants iteration.
该算法以二分法、割线法迭代为基础，采用分而治之策略。
The basic principle of this method is introduced, the recurrence formula for the tangent of secants is deduced and the flow chart of the correspondent program is presented.
